A 14,000-kg boxcar is coasting at 1.50 m/s along a horizontal track when it sudd

Question

A 14,000-kg boxcar is coasting at 1.50 m/s along a horizontal track when it suddenly hits and couples with a stationary 10,000-kg boxcar. What is the speed of the cars just after the collision? 9. A 475-gram ball is traveling horizontally at 12.0 m/s to the left when it is suddenly struck horizontally by a bat, causing it to reverse direction and initially travel at 8.50 m/s to the right. If the bat produced an average force of 1275 N on the ball, for how long (in milliseconds) was it in contact with the ball?

Explanation / Answer

apply the law of conservartion of momentum

as m1u1+ m2u2 = (m1+m2) V

m1 is mass   = 14000 kg

u1 = intial velcotiy = 1.5 m/s

m2 = 10000 kg

u2 = 0

so common Velcoity V = (14000 * 1.5) +0/(14000 + 10000)

V = 0.875 m/s -------------<<<<<<<<<<<<<Answer

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